Circuitry for Quantum Computing

Scalable quantum computing with Josephson
charge qubits

A goal of quantum information technology is to control the quantum state
of a system, including its preparation, manipulation, and measurement.
However, scalability to many qubits and controlled connectivity between
any selected qubits are two of the major stumbling blocks to achieve
quantum computing (QC). Here we propose an experimental method, using
Josephson charge qubits, to efficiently solve these two central problems.
The proposed QC architecture is scalable since any two charge qubits
can be effectively coupled by an experimentally accessible
inductance. More importantly, we formulate an efficient and
realizable QC scheme that requires only one (instead of two or more)
two-bit operation to implement conditional gates.